110 RC Requirements for Electrical Installations（110 RC电气安装的要求）.pdf

ARTICLE Requirements for 110 Electrical Installations INTRODUCTION TO ARTICLE 110—REQUIREMENTS FOR ELECTRICAL INSTALLATIONS Article 110 sets the stage for how you’ll implement the rest of the NEC. This article contains a few of the most important and yet neglected parts of the Code. For example: • How should conductors be terminated • What kinds of warnings, markings, and identification does a given installation require • What’s the right working clearance for a given installation • What do the temperature limitations at terminals mean • What are the NEC requirements for dealing with flash protection It’s critical that you master Article 110. As you read this article, you’re building your foundation for correctly applying the NEC. In fact, this article itself is a foundation for much of the Code. The purpose for the National Electrical Code is to provide a safe installation, but Article 110 is perhaps focused a little more on providing an installation that is safe for the installer and maintenance electrician, so time spent in this article is time well spent. Essential Rule 7 110.2 PART I. GENERAL REQUIREMENTS 110.2 Approval of Conductors and Equipment. The authority having jurisdiction must approve all electrical conductors and equipment. Figure 110–1 Author’s Comment: For a better understanding of prod- uct approval, review 90.4, 90.7, 110.3 and the definitions for “Approved,” “Identified,” “Labeled,” and “Listed” in Article 100. Essential Rule 8 110.3 Figure 110–1 110.3 Examination, Identification, Installation, and Use of Equipme